Commutator and method of making same.



Patented Oct. 9, I900. E. R. GILL.

GOMMUTATOR AND METHOD OF MAKING SAME.

(Application filed Mar. 1, 1900.] (N9 Model.)

)IIIIIIIIIII,

51 14 q t wow; Ma=

UNITED STATES PATENT OFFICE.

EDWIN R. GILL, OF NEWV YORK, N. Y., ASSIGNOR TO THE INVENTION DEVELOPING COMPANY, OF NEW JERSEY.

COMMUTATOR AND METHOD OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 659,443, dated October 9, 1900.

Application filed March 1, 1900- Serial No. 6,981. (No model.)

To all whom it may concern.-

Be it known that I, EDWIN R. GILL, a citizen of the United States, residing in the cit-y, county, and State ofNew York, havein vented a certain new and useful Improvement in Commutators and Methods of Making the Same, of which the followingis aspecification.

My present invention has relation to a cheap and simple form of commutator, principally useful with small electric motors, such as are used for fans and the like.

My invention is illustrated in the accompanying drawings, wherein Figure 1 shows in vertical median section one form of machine or tool for making my improved commutator. Fig. 2 shows a partlyfinished commutator in perspective. Fig. 3 is an end view of a finished commutator, and Fig. 4 is a median section of the device shown in Fig. 2.

In making my improved commutator I first form a cylindrical core 1, of insulating material, such as hard rubber or fiber, and pierce the same centrally, as at 2, to accommodate the shaft of the motor-armature. To the outer surface of the insulating-cylinder 1 I apply a tube of copper 3 of proper thickness and somewhat longer than the cylinder 1. This is plainly shown in Fig. l. The overhanging circular edges of the copper tube are then forced inward, as shown at 4. This may be accomplished by diverse means, and in Fig. 1 is shown a device for accomplishing this step in the process of manufacture simply and rapidly in one operation. The fiber cylinder and surrounding tube are supported upon the lower die 5 within the close-fitting holder 6. The plunger-die 7 is then brought down upon the cylinder and tube so as to bend the edges over, as shown in Fig. 4, the plunger being centered and guided by the central rod 8. The edges of the copper are thus forced into the insulating-core, and a firmly-combined fiber and copper is produced in the form shown in Figs. 2 and 3.

v The commutator is finished by simply cutting the tube into the required number of divisions, the cuts 9 being extended down into the fiber, as shown in Fig. 3, beyond the level of the turned-over copper edges. By this means the fiber cylinder is made to carry the desired number of commutator-sections insulated from one another and firmly fixed in place.

My invention is not limited to the use of any particular material for the cylinder 1 nor to any particular method or means for bending the ends of the copper tube down upon said cylinder. My invention also covers the making of commutators wherein only one end of the tube 3 is turned in.

What I claim is- 1. The method of making commutators which consists in forming an insulating cylindrical core, fitting thereon a conductingtube long enough to overhang said core, turning in the circular edge of said tube so as to make it grip the core and cutting the tube and core into peripheral sections.

2. A commutator consisting of a cylindrical insulating-core and separate conducting-sections on the periphery of said core, said sections being turned down into the material of the core at the end.

EDWIN R. GILL.

Witnesses:

HAROLD S. MAOKAYE, JAMES S. LAING. 

